### ZPHS01B Multi-in-One Sensor Module Overview The **ZPHS01B** is a highly integrated air quality monitoring module developed by Winsen Electronics. It is designed to measure multiple environmental parameters simultaneously using various sensing technologies integrated into a single compact board. --- ### 1. Key Electronic Components & Sensors The module integrates several distinct sensing elements to provide a comprehensive air quality profile: | Component Type | Parameter Measured | Sensing Principle | |:---|:---|:---| | **Laser Dust Sensor** | PM2.5 (Particulate Matter) | Laser Scattering | | **Electrochemical Sensor** | Formaldehyde (CH2O) | Chemical-Electric Conversion | | **Nondispersive Infrared (NDIR)** | Carbon Dioxide (CO2) | Infrared Absorption | | **MEMS / Semiconductor** | VOCs (Volatile Organic Compounds) | Metal Oxide Semiconductor | | **Digital Humidity & Temp** | Temperature & Relative Humidity | Capacitive/Polymer | --- ### 2. Technical Specifications Below are the typical electronic characteristics for the ZPHS01B: | Feature | Specification | |:---|:---| | **Operating Voltage** | 5.0V ± 0.1V DC | | **Average Current** | < 80mA | | **Peak Current** | < 200mA | | **Interface Level** | UART (TTL level 3.3V) | | **Output Data** | PM2.5, CO2, CH2O, TVOC, Temperature, Humidity | | **Warm-up Time** | ≤ 3 minutes | --- ### 3. Communication Protocol (UART) The module communicates via a serial interface. This allows microcontrollers (like Arduino, ESP32, or STM32) to read all environmental data through a single RX/TX pair. #### UART Configuration: - **Baud Rate:** 9600 - **Data Bits:** 8 - **Stop Bits:** 1 - **Check Bit:** None ```c // Example of a typical 26-byte data frame structure: // [Start Byte] [Length] [CO2 High/Low] [CH2O High/Low] [TVOC High/Low] // [PM2.5 High/Low] [Temp High/Low] [Hum High/Low] [Checksum] ``` --- ### 4. Hardware Pinout The module usually features a 5-pin or 7-pin connector (depending on the specific revision): 1. **Pin 1 (VCC):** +5V Power Input. 2. **Pin 2 (GND):** Ground. 3. **Pin 3 (RX):** UART Receive (3.3V). 4. **Pin 4 (TX):** UART Transmit (3.3V). 5. **Pin 5 (NC/Reset):** Often used for factory reset or left unconnected. --- ### 5. Application Considerations * **Power Supply:** Ensure a stable 5V supply. Noise on the power line can affect the precision of the electrochemical and NDIR sensors. * **Airflow:** The module relies on internal fans or natural diffusion. Do not block the intake/exhaust vents. * **Cross-Interference:** While highly accurate, the VOC and Formaldehyde sensors can show cross-sensitivity to high concentrations of alcohol or strong perfumes.